Use babel for ES6 / ES2015 support

.eslintrc

@@ -1,4 +1,7 @@
 {
+    "parserOptions": {
+        "ecmaVersion": 6
+    },
     "rules": {
         "curly": [2, "multi-line"],
         "eol-last": [2],

.idea/misc.xml

@@ -1,5 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="JavaScriptSettings">
+    <option name="languageLevel" value="ES6" />
+  </component>
   <component name="ProjectLevelVcsManager" settingsEditedManually="false">
     <OptionsSetting value="true" id="Add" />
     <OptionsSetting value="true" id="Remove" />

package.json

@@ -14,9 +14,12 @@
     "test": "make test"
   },
   "dependencies": {
+    "babel-core": "6.9.1",
+    "babel-eslint": "6.0.4",
+    "babel-loader": "6.2.4",
+    "babel-preset-es2015": "6.9.0",
     "eslint": "2.7.0",
     "json-loader": "0.5.4",
-    "promise": "7.1.1",
     "raw-loader": "0.5.1",
     "svg-to-image": "1.1.3",
     "tap": "5.7.1",

src/WorkerRemote.js

@@ -1,6 +1,4 @@
 
-var Promise = require('promise');
-
 var WorkerMessages = require('./WorkerMessages');
 
 function WorkerRemote() {
@@ -54,7 +52,7 @@ WorkerRemote.prototype._onmessage = function(message) {
 
 /**
  * Create a new Drawable and add it to the scene.
- * @returns {int} The ID of the new Drawable.
+ * @returns {Promise.<int>} The ID of the new Drawable.
  */
 WorkerRemote.prototype.createDrawable = function() {
     var instance = this;

webpack.config.js

@@ -15,6 +15,13 @@ module.exports = {
     },
     module: {
         loaders: [
+            {
+                test: /\.js$/,
+                loader: 'babel-loader',
+                query: {
+                    presets: ['es2015']
+                }
+            },
             {
                 test: /\.json$/,
                 loader: 'json-loader'